1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Cadence PCIe platform  driver.
  4 *
  5 * Copyright (c) 2019, Cadence Design Systems
  6 * Author: Tom Joseph <tjoseph@cadence.com>
  7 */
  8#include <linux/kernel.h>
  9#include <linux/of.h>
 10#include <linux/of_pci.h>
 11#include <linux/platform_device.h>
 12#include <linux/pm_runtime.h>
 13#include "pcie-cadence.h"
 14
 15#define CDNS_PLAT_CPU_TO_BUS_ADDR	0x0FFFFFFF
 16
 17/**
 18 * struct cdns_plat_pcie - private data for this PCIe platform driver
 19 * @pcie: Cadence PCIe controller
 20 */
 21struct cdns_plat_pcie {
 22	struct cdns_pcie        *pcie;
 23};
 24
 25struct cdns_plat_pcie_of_data {
 26	bool is_rc;
 27};
 28
 29static const struct of_device_id cdns_plat_pcie_of_match[];
 30
 31static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr)
 32{
 33	return cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR;
 34}
 35
 36static const struct cdns_pcie_ops cdns_plat_ops = {
 37	.cpu_addr_fixup = cdns_plat_cpu_addr_fixup,
 38};
 39
 40static int cdns_plat_pcie_probe(struct platform_device *pdev)
 41{
 42	const struct cdns_plat_pcie_of_data *data;
 43	struct cdns_plat_pcie *cdns_plat_pcie;
 44	struct device *dev = &pdev->dev;
 45	struct pci_host_bridge *bridge;
 46	struct cdns_pcie_ep *ep;
 47	struct cdns_pcie_rc *rc;
 48	int phy_count;
 49	bool is_rc;
 50	int ret;
 51
 52	data = of_device_get_match_data(dev);
 53	if (!data)
 54		return -EINVAL;
 55
 56	is_rc = data->is_rc;
 57
 58	pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
 59	cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
 60	if (!cdns_plat_pcie)
 61		return -ENOMEM;
 62
 63	platform_set_drvdata(pdev, cdns_plat_pcie);
 64	if (is_rc) {
 65		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
 66			return -ENODEV;
 67
 68		bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
 69		if (!bridge)
 70			return -ENOMEM;
 71
 72		rc = pci_host_bridge_priv(bridge);
 73		rc->pcie.dev = dev;
 74		rc->pcie.ops = &cdns_plat_ops;
 75		cdns_plat_pcie->pcie = &rc->pcie;
 76
 77		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
 78		if (ret) {
 79			dev_err(dev, "failed to init phy\n");
 80			return ret;
 81		}
 82		pm_runtime_enable(dev);
 83		ret = pm_runtime_get_sync(dev);
 84		if (ret < 0) {
 85			dev_err(dev, "pm_runtime_get_sync() failed\n");
 86			goto err_get_sync;
 87		}
 88
 89		ret = cdns_pcie_host_setup(rc);
 90		if (ret)
 91			goto err_init;
 92	} else {
 93		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP))
 94			return -ENODEV;
 95
 96		ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
 97		if (!ep)
 98			return -ENOMEM;
 99
100		ep->pcie.dev = dev;
101		ep->pcie.ops = &cdns_plat_ops;
102		cdns_plat_pcie->pcie = &ep->pcie;
103
104		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
105		if (ret) {
106			dev_err(dev, "failed to init phy\n");
107			return ret;
108		}
109
110		pm_runtime_enable(dev);
111		ret = pm_runtime_get_sync(dev);
112		if (ret < 0) {
113			dev_err(dev, "pm_runtime_get_sync() failed\n");
114			goto err_get_sync;
115		}
116
117		ret = cdns_pcie_ep_setup(ep);
118		if (ret)
119			goto err_init;
120	}
121
122	return 0;
123
124 err_init:
125 err_get_sync:
126	pm_runtime_put_sync(dev);
127	pm_runtime_disable(dev);
128	cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
129	phy_count = cdns_plat_pcie->pcie->phy_count;
130	while (phy_count--)
131		device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
132
133	return 0;
134}
135
136static void cdns_plat_pcie_shutdown(struct platform_device *pdev)
137{
138	struct device *dev = &pdev->dev;
139	struct cdns_pcie *pcie = dev_get_drvdata(dev);
140	int ret;
141
142	ret = pm_runtime_put_sync(dev);
143	if (ret < 0)
144		dev_dbg(dev, "pm_runtime_put_sync failed\n");
145
146	pm_runtime_disable(dev);
147
148	cdns_pcie_disable_phy(pcie);
149}
150
151static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = {
152	.is_rc = true,
153};
154
155static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = {
156	.is_rc = false,
157};
158
159static const struct of_device_id cdns_plat_pcie_of_match[] = {
160	{
161		.compatible = "cdns,cdns-pcie-host",
162		.data = &cdns_plat_pcie_host_of_data,
163	},
164	{
165		.compatible = "cdns,cdns-pcie-ep",
166		.data = &cdns_plat_pcie_ep_of_data,
167	},
168	{},
169};
170
171static struct platform_driver cdns_plat_pcie_driver = {
172	.driver = {
173		.name = "cdns-pcie",
174		.of_match_table = cdns_plat_pcie_of_match,
175		.pm	= &cdns_pcie_pm_ops,
176	},
177	.probe = cdns_plat_pcie_probe,
178	.shutdown = cdns_plat_pcie_shutdown,
179};
180builtin_platform_driver(cdns_plat_pcie_driver);